Fix setDefaultTimeout for beforeAll and afterAll (#648)

Previously, the timeout defined by setDefaultTimeout did not apply for
beforeAll and afterAll blocks. This change fixes that.

The new implementation makes use of the fact that Jasmine processes
beforeAll in FIFO order and afterAll in LIFO order.

spec/helpers.js

@@ -39,12 +39,31 @@ module.exports.tmpDir = function (suffix = 'test') {
     return fs.mkdtempSync(dir);
 };
 
+/**
+ * Sets the default timeout for the current suite.
+ *
+ * Restores the previous timeout after the suite has finished. The timeout
+ * applies to all `before*`, `after*` and `it` blocks within the suite.
+ *
+ * Must be called before defining any of the aforementioned blocks.
+ *
+ * @param {Number} timeout The desired default timeout in ms
+ */
 module.exports.setDefaultTimeout = timeout => {
     const originalTimeout = jasmine.DEFAULT_TIMEOUT_INTERVAL;
+
+    // Ensure new default timeout applies to beforeAll blocks
+    beforeAll(() => {
+        jasmine.DEFAULT_TIMEOUT_INTERVAL = timeout;
+    });
+
+    // Refresh setting before every test, just to be safe
     beforeEach(() => {
         jasmine.DEFAULT_TIMEOUT_INTERVAL = timeout;
     });
-    afterEach(() => {
+
+    // Revert to original setting after the last afterAll
+    afterAll(() => {
         jasmine.DEFAULT_TIMEOUT_INTERVAL = originalTimeout;
     });
 };